1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
#include <netinet/in.h>
#include <string.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>
#include "mctypes.h"
#include "mcnetwork.h"
void usage(const char *program_name){
printf("Usage: %s [-p PROTOCOL]... ADDRESS[:PORT]\n\
Pings a Minecraft server using the Server List Ping protocol.\n\n\
-h display this help and exit\n\
-p PROTOCOL uses specified protocol number.\n"
, program_name);
}
int main(int argc, char *argv[])
{
char *port_s, *address;
unsigned short port;
unsigned int protocol_ver, p_flag = 0;
int opt;
while ((opt = getopt(argc, argv, "hp:")) != -1) {
switch (opt) {
case 'h':
usage(argv[0]);
exit(EXIT_SUCCESS);
case 'p':
protocol_ver = atoi(optarg);
p_flag = 1;
break;
default:
break;
}
}
if (optind >= argc) {
usage(argv[0]);
exit(EXIT_FAILURE);
}
address = argv[optind];
if ((port_s = strchr(address, ':')) != NULL) {
address[strlen(address) - strlen(port_s)] = '\0';
port_s++;
} else
port_s = "25565";
if (p_flag == 0) {
protocol_ver = 756;
}
port = atoi(port_s);
int s;
if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0)
perror("bad socket\n");
connect_mc_server(s, address, port, PING);
send_ping_handshake(s, protocol_ver, address, port, 1);
send_ping_packet(s, 0x0, 0, NULL); // request packet (0x0 with no fields)
packet response = recv_packet(s);
#ifdef _DEBUG
printf("length:\t%u\n", from_varint(response.length));
printf("id:\t%d\n", from_varint(response.id));
for (int i = 0; i < from_varint(response.length) - size_varint(response.id); ++i) {
printf("%02X ", ((unsigned char*) response.data)[i]);
}
printf("\n");
#endif
string json = deserialize_string(&response.data);
#ifdef _DEBUG
printf("json length:\t%u\n", from_varint(json.length));
#endif
for (int i = 0; i < from_varint(json.length); ++i) {
printf("%c", json.content[i]);
}
printf("\n");
close(s);
return 0;
}
|
